package cc.chengheng.结构型.E外观模式;

public class Stereo {
    private static Stereo instance = new Stereo();

    public static Stereo getInstance() {
        return instance;
    }

    public void on() {
        System.out.println("Stereo on");
    }

    public void off() {
        System.out.println("Stereo off");
    }

    public void up() {
        System.out.println("Stereo up...");
    }
}
